Don't have an overall favorite so here.
Daedric Armor finally looks bad-ass again.
No, not Oblivion bad-ass, Morrowind bad-ass.
Truly black and red again, in oblivion it looked pathetic. But now in Skyrim, it feels right.
Redesigned Ebony style looks good too. Replacing the gold trim with silver really does it for me.
Dragon plate looks pretty sweet too, but is let down by the helmet.
Ancient Nord Armor is the opposite, the helm looks sweet. But the rest is naff.
Nightingale gets a mention for reminding me of Darth Revan from KOTOR (also steel plate = Mandelorian)
Thieves guild Looks awesome too, better than standard Dark-brotherhood armor by miles.
And overall, the redesigned base armor Iron, fur, steel, leather, hide etc. are all brilliant looking, much better than Oblivion, ith exception to the DarkBrotherhood armor